Die assembly



A. R. RIVERA DIE ASSEMBLY Nov; 4, 195s 2 Sheets-Sheet 1 Filed July 25,; 1957 a i l. m z i, i.. c@ /ll VU 'I l/l I. H| T l, Q/.mv 111 JW 4 nw l ,LI a.

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Q t 4 4 4 Arran/y Nov. 4, 1958 A. R. RIVERA 2,858,886

DIE ASSEMBLY Filed July 25, 195'? 2 Sheets-Sheet 2 IJ: 6 j INVENTOR. V 4/ vn/65.'. l?. mue-R4 .4 1' roms/E y United @tat-es assess@ DIE ASSEMBLY ngel R. Rivera, Detroit, Mieli.

Application .lilly 25, '1957, Serial No. 674,217 3 Claims. (or. raaf-5s) for; and without the necessity of disassembling the elemcntsof which the die is composed.

A further object of the invention is to provide a die of such structure that the operative member such as the blade may be easily removed from the main body portion without the necessity of moving the main body portion from the place upon which the body is mounted. This refers to such events as, for instance, when the blade -has tof be ground to render it more eflcient. Iv shallnow describe my improvement with reference to the accompanying drawings in which:

Fig. 1' is a perspective view of the die, including the V main body portion and the movable operative element thereof;

`Ineral 10, has the form of a rectangular block defined by hat surfaces, including a flat rear surface 11, a flat top Ysurface 12, and a flat front surface 13.v The block V1t? is provided with a bore 14 extending through the block from the rear surface into the front portion thereof where it is expanded radially'into a cylindrical aperture 15, opening outwardly. The bore 14 is located centrally within said block 10, being at a point intermediate the sides `of the block and intermediate the top and bottom thereof as best shown in Fig., 1. ,"Disposed'within the aperture 15 is a pinion 16, the

pinion being axially mounted upon a shaft 17 which` extends Arearwardly from the pinion into said bore 14. The rear portion of the shaft within the bore is provided with .an annular groove 18, and includes an end portion 19 of reduced diameter. The last named portion 19 of the vshaft serves as 'an axial support of a worm gear 20,the latter including a cylindrical hub portion 21 which is secured to the shaft by means of a diametricallyI disposed pin 22. A vThe'worm gear 19 is in mesh with a worm 23, disposed yin arvertical bore 23a, the worm being provided with a head 24 in an expanded portion 2S of the bore. lSaid lhead 24 is of the socket type for application of a wrench yfor the operation of the worm.

To prevent displacement of the worm, the latter is arent @hice Patented Nov. 4, 1958 made with an annular groove 26 for engagement with va. retaining pin 27. The pin 27 `is'located .in ashore 28 .extending parallel to the bore 14 in the upper portion of :the block shown in Figs. f1 and 2. Similarly, 4to prevent fdisplacement of the shaft 17 from the bore 14, asetscrew 29 is threaded into a vertical bore 30, the screw terminating at its lower end with a smoothl tip 31 which ,projects into the above said groove 18 in the shaft 17, whilera socket type screw 32 is threaded into the bore 30 against the set screw therebelow.

The front portion of the block contains'twofhorizontal slideways, one 33, being located in the upper portion ,of the block, the other 34, in the ylower `portion thereof. Each of the slideways has the form of anoblong groove open towards the front of the block andextendingfrom one end of the block to the other. Thegroove is defined by a flat horizontal bottom or lowerk surface, a flathorizontal top surface, and by a vertical back ,surface 38,

which is set at an angle to the flat vertical front surface of the block. As a result thereof, the slideway along -its length is of gradually increasing depth as measured with relation to said front surface of the block. However, while the depth of one slideway increases in one :direction of its length, the depth of the other slideway increases yin the opposite direction of its length.

This increase in the depth of the slideway 34, is shown in Fig. 5 in which the block is` shown in horizontal section disclosing the shape of the slideway as seenafrorn above. It will be noted `on reference to Fig. 6, that the lower surface of the upper slideway intersects the circular-aper ture 15 in the front portion of the block, and that similarly the upper surface of thelower slideway intersects said aperture from below. Located. in'each slideway is anloblong rack 35 in mesh with the pinion 16. Each rack is of the same thickness all along its length, butof .a gradually increasing width so. that when viewed in .plan elevationit has the shape ofva wedge. This is shown in Fig. 5, which discloses :the rack vin Athe lower slideway.34. When the rack is within a -respective slideway,l in what may be considered its normal or initialposition, one-.side

' 36 `of the rack is flush with theoutervsurface l13 offthe block While the opposite side 37 isset at anangle to said surface, being in a sliding abutment alongitslength with the back wall 38 of .the respective slideway. Byreason of the angularly set back wall 3.8, Vandby reason ofithe wedge-shape of the rack, the rack, if-rnoved endwisein the slideway in the direction of its decreasing.depth,.will be forced outwardly beyond the .front facey 13 of the block.

It will be noted that, as shown in Figs. 5 and.6, .each wedge 35 is shorter thanA the length ,ofthe slidewayin which it is located, and that at itsnarrowend, thewedge includes a portion 35a which is devoid .of teeth,this .being necessary to allow movement ofthe wedgecrosswise. over the end of the respective'bolty44 projectingfrom ,the-

block and threaded into'theblade 46.

' Drilled into the front portion of the block, between .the twouslideways 33 andfiifi,y aretwo ,bores-39 these fbeing spaced from each otheralong .an imaginaryehorizontal line, each of the bores .serving to support a.=horizontally disposed guiding pinA `Lit) which,.projects outwardly ,of/the block. In addition the block containstwo .holes.,41-.ex tending parallel to the bore 1d, one rbeinglocated onfone side thereof in the upper portion ofthe block,v the `other to the other side of the bore 14 in -the-lower portion ,of said block. One of the holes intersects-yinpart, the. upper slideway 33, while theother holezintersects in .partfthe lower slideway 34. Each of .the holes is threaded, ybut includes an unthreaded rearportion .41a.of.expanded diameter, each of the holes serving 'for reception of. a bolt 44 having a socket type head-`45."The lbolts. are adapted to project from withintheblock-.beyond the front 3 surface thereof for connection with an operative member of the die marked 46. This is a thick vertical blade defined in its upper portion by a face 47 slanting upwardly and' outwardly from the block, and a fiat narrow top 43 extending horizontally, for intersection with the flat front face 49 of the blade along a straight horizontal line which defines the shearing edge 5t! of the blade.

For the purpose of being secured to the block by means of said bolts, 44, the blade has two transverse bores 51 which are threaded and which are spaced from each other so as to be brought into register with the holes di. Furthermore, the blade is provided with the bores 5.?, for lreception of two guiding pins 41'?. The position of the blade when connected to the block by said bolts is such `that the top portion 4% of the blade with the cutting edge 50 is at a level above the top surface -of the block it) as shown in Fig. l. As the block l@ is to be held in place upon a supporting base or platform, it is provided with two vertical holes 53 for employment of screws 56, yby means `of which the block may be drawn in tight against said supporting base, while two other vertical `holes 54 open at the top and extending downwardly 'through the block, serve to receive dowel pins S5 to hold the block against any horizontal movement upon said `supporting base, which is not shown.

I shall now describe the operation of the mechanism ldisclosed herein.

For the purpose of the operative use of the die, the block is mounted on a stati-onary support and is held in place by screws 56, described above. The blade 46 is held tightly against the front of the block by bolts da. The stock to be cut, such as a stack of sheet paper, marked 60, is supported from below on a vertical movable table, which is not shown, and is adapted to be brought with said supporting table, under pressure downwardly so that the stack of paper is brought from above against the shearing edge Sti `of the blade. As this is a common practice, any further description of the shearing operation does not appear to be needed. In time, the cutting edge becomes worn and dull, where- `upon it becomes necessary to have the blade disconnected from the block and to have its lfront face ground sufficiently to again secure an efiicient cutting edge. The removal of the blade from the block is an easy problem, as all that is needed is to unscrew the bolts 44 from the threaded bores 51 within the blade. However, when the blade is again secured to the block by the same bolts, `it becomes necessary to move the blade forwardly from the position held by said blade before the grinding operation. This forward movement or adjustment is called for to compensate for the decrease in the thickness of the blade because of the grinding operation. The afjustment is effected rst bypartly unscrewing said bolts 144 from the bores 51 within the blade. Thereupon, by means of a wrench applied to the head 24 of the worm 23, a rotary movement is imparted to the worm gear 2d. As the gear rotates about its axis, it imparts a similar rotary action to the pinion 16, by means of the shaft i7. t

`The pinion being in mesh with the racks 35 will cause said racks to move in opposite direction from each other. `As shown in Fig. 5, the rack disclosed therein, is adapted to be shifted longitudinally in the direction of the arrow marked r. As the rack is shifted in said direction, which is the direction `of the decreasing depth of the lower slideway, the opposite side of the rack will gradually project outwardly of the slideway, bearing against the blade and pushing it outwardly to a new position, shown in dotted lines in Figs. 4 and 5. Obviously the upper rack moving in the opposite direction, duplicates the action of the first described rack in pushing the blade away from the block. After the blade has been sufiiciently moved forwardly of the block, the bolts 44 are used to draw the blade into a tight contact with the front sides of the racks to hold the blade against movement.

It will be understood that the structure shown by me may be modified without departing from the inventive principle disclosed herein, and that said mechanism may be employed for adjustment or movement of other elements than a blade.

After having described my invention, I wish to present the following claims:

l. A die including a stationary block defined by a fiat front surface having two oblong grooves disposed horizontally in a spaced parallel relation to each other, each groove being defined by a at bottom, fiat top, and a back wall set obliquely to said front face of the block, one groove having a decreasing depth in one direction of the length of the groove, while the other groove has a decreasing depth in the opposite direction of its length, a wedge shaped rack in each groove, each rack having one side disposed parallel to the front face of the block while its other side bears slidingly against the back wall of the respective groove, the teeth of one rackfacing the teeth of the other rack, the block being provided with a bore running at light angle to the front face of the block and` terminating with a radially expanded cavity in the front portion thereof, the cavity intersecting both grooves, a shaft dispo-sed within said bore, a pinion mounted on one end of the shaft for rotation therewith, said pinion being located within said cavity and being in mesh with both racks, a worm gear axially mounted on the other end of the shaft, a worm disposed within a vertical bore in the block, and being in engagement with the worm gear, the worm serving as a means for the operation of the pinion, the block being further pro-y vided with a plurality of holes extending parallel to the shaft, a flat blade disposed parallel to the front face of the block and including a cutting edge, the blade containing a plurality of transverse, threaded bores, and a bolt passing through each hole in the block and threaded into a respective bore in the blade, to draw the blade towards the block.

2. A die including a stationary rectangular block having a flat front face, the block being provided with a circular cavity extending at right angle lfrom the said front face rearwardly, and with two horizontal grooves disposed parallel to each other, one intersecting the cavity at the top, the other intersecting the cavity at the bottom, each of the grooves being defined in lpart by a back wall, one groove gradually increasing in depth in one direction of its length, the other groove gradually increasing in depth in the opposite direction of its length, a pinion located within said cavity for roation therein, a wedge shaped rack in each groove, one side of the wedge being its front side, extending parallel to the front face of the block, the other, or the rear side of the wedge, being in abutment along its length with the back wall of the gro-ove in which the rack is located, the teeth of yone rack being in mesh with the pinion from below, the teeth of the other rack being in mesh with the pinion from above, a shaft extending axially from the pinionrearwardly of the front face of the block, and gear means p within the block for the operation of the shaft and the pinion, the block being further provided with a plurality of holes extending parallel to the shaft, a flat blade4 disposed parallel to the front face of the block and including a cutting edge, the blade containing a plurality of transverse, threaded bores, and a bolt passing through each hole in the block and threaded into a respective bore in the blade, to draw the blade towards the block.

3. A die including a main body portion which is stationary, the body portion including a flat front face provided with two parallel slideways open towards the front face, each slideway being in part defined by a back wall set on an angle to the front face of the body portion, one slideway decreasing in depth in one direction `of itslength, the other slideway decreasing in depth in theropposite direction of its length, a wedge like rack disposed lengthwise in each slideway, one side of each rack being parallel to said front face of the main body portion, the other side being in a sliding abutment with the back wall of the respective slideway, the teeth of one rack facing the teeth of the other rack, a pinion disposed within the main body portion crosswise to the racks in a space therebetween, and being in mesh with both of them, a shaft axially extending from the pinion rearwardly of the front face of the main body portion, a gear wheel mounted on the shaft for rotation therewith, and a worm in mesh with said gear wheel for the operation thereof, the body portion of the die being provided with a plurality of holes 10 extending through said body portion parallel to the shaft, a flat blade disposed in front of the body portion parallel to its flat face, the blade including a cutting edge and containing a plurality of transverse, threaded bores for register with the last named holes in the body of the die, and a bolt in each hole, the bolt being threaded at one end for engagement with the threaded bores in the blade 5 to draw the blade towards said body portion.

References Cited in the iile of this patent UNITED STATES PATENTS 1,288,966 Nielsen Dec. 24, 1918 2,525,401 Dehn Oct. 10, 1950 2,688,367 Maeser Sept. 7, 1954 

